Ischemia

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Related to silent ischemia: silent myocardial ischemia

ischemia

[i′skē·mē·ə]
(medicine)
Localized tissue anemia as a result of obstruction of the blood supply or to vasoconstriction.

Ischemia

 

a local deficiency of blood; insufficient blood in an organ or tissue because of the narrowing or complete occlusion of the lumen of an afferent artery.

Transitory ischemia (like hyperemia) may result from physiological regulation of the blood supply, such as in reflex spasm of an artery caused by a mental factor (fright); the influence of pain, cold, chemical substances (epinephrine, ergotin), and biological stimuli (bacteria, toxins); the obstruction of an artery by a thrombus or embolus; constriction of the lumen of a blood vessel in connection with an atherosclerotic or inflammatory process in the wall; or compression of an artery by a tumor, scar, or foreign body. The aftereffects of ischemia depend on the degree of disruption of the blood flow, the rate of development and duration of the ischemia, the sensitivity of the tissue to oxygen deficiency, and the general condition of the body. Ischemia may end in complete restoration of the structure and function of the affected organ or tissue, but it also may lead to necrosis (infarct). The central nervous system and heart muscle are particularly sensitive to ischemia.

N. R. PALEEV

References in periodicals archive ?
Deedwania speculates that stress, sticky platelets, hormones, or other, unidentified factors may lead to the higher rates of silent ischemia in the morning.
Similar results favoring PM dosing were demonstrated for other key measures of efficacy, time to onset of angina and time to onset of silent ischemia.
QDS will provide the Express II device to physicians who prescribe cardiac event monitoring to their patients with transient arrhythmias, including syncopal patients unable to activate a recorder due to lack of consciousness and patients with suspected silent ischemia.
Silent ischemia is a temporary shortage of oxygen to the heart that occurs without pain.
Cox continued to say, "autonomic dysfunction has also been correlated with an increased risk in diabetes for heart attacks, silent ischemia and sudden death.